Rory, you broke my sleep. Spent a bunch of hours searching thru web anything about the track.
That is what i found:
http://www.discomania.com/new/prof/product.php?id=124608
http://www.troonik.com/r/16/4590/fatboy-slim-wonderful-night-pt-2.aspx
http://fatboyslim.h1.ru/disco/albums/wonderfulnight.html
It says that there is ‘Wonderful Night CD2’ (catalog name ‘SKINT104CDX’) with Jazz Odyssey as bonus track.
But no any online shop with ‘SKINT104CDX’ CD lists the track on it.
So, maybe it was planned to include Jazz Odyssey, and then cancelled by some reason.
Or maybe it is already included on that CD as hidden track, waiting for some crazy FBS fan =).